Plain files
Real `.md` files you can keep in any repo, folder, or agent workflow.
Free native Markdown editor
Aviv Editor
A calm native Markdown editor with writing and preview in one clean surface.
Built natively for macOS and Windows, Aviv avoids a browser shell and works directly with real Markdown files. Actual resource use varies by operating system, document, and build.
Native desktop app
Native desktop builds
No browser shell
No license key
MIT open source
NativeSwift + AppKit and WinUI 3 builds.
CalmOne surface, no preview pane.
PlainReal `.md` files on disk.
Markdown without the split-screen tax.
Aviv keeps one editable surface: readable like a document, honest like plain text, and quiet enough for daily work.
Live surface
Rendered Markdown stays inline while the source remains editable.
Quiet chrome
Minimal controls, no dashboard, no mode switcher, no clutter.
Native structure
Native desktop builds instead of a browser shell around a web app.
Focused codebase
Focused native code keeps the architecture direct for everyday notes and specs without bundling a browser shell.
Open source
MIT licensed, public on GitHub, free without a paid unlock.
Write in one place.
The document stays readable while you edit, so writing does not become a preview-management task.
Keep the structure intact.
Markdown remains plain, portable, and agent-readable underneath the calm visual layer.
Use local images naturally.
Attachments render inline while Aviv preserves the original Markdown source path.
The language of agents
Markdown is the calm format agents already understand.
Prompts, specs, decisions, and agent instructions need a format that reads well for people and parses cleanly for machines. Markdown is that common ground.
Agent prompts and system instructions
Implementation plans and acceptance criteria
Evidence-first reports and decision logs
Reusable business knowledge in Git
Portable documentation for humans and models
Native architecture, calm interface.
Aviv uses Swift and AppKit on macOS and WinUI 3 on Windows so the editor can stay native without carrying a browser shell. Resource use varies by platform and document.
Native windows
macOS document behavior with tabs and multiple windows.
Quiet minimap
A small map follows the real rendered viewport.
Native print
Print and page setup use the macOS system flow.
Native runtime
No browser shell. Measure resource use on the target operating system and representative documents.
A4 print mode
Blog and A4 formats keep writing calm while printing uses paper-aware margins.
Default app prompt
Native startup prompts can help make Aviv the app that opens Markdown files.
Download
Free, native, no key.
Aviv is a free native download for macOS and Windows. No lite mode, no license key, no subscription prompt, no hidden unlock, and no heavy browser-shell footprint.